A cylindrical, externally threaded item having a centrally located hole specifically designed to retain by means of either a raised box (shoulder), or counterbore, countersink, or a similar shaped recess, an optical element such as a lens, reticle, cell, and the like, in optical assemblies. It must have drilled holes or slots to facilitate assembly and disassembly. For items which house the optical element(s), and form the internal or central portions of an optical system, see cell, optical element. Excludes ring, externally threaded.
Classification: Military equipments not identified by kind
NSN 2925-01-239-6044
NSN 5985-01-238-9509
NSN 5930-00-203-5594
NSN 6135-01-010-0891
NSN 5855-01-571-3903
NSN 5965-01-577-8503
NSN 5999-01-273-9247
NSN 5895-00-923-2467
NSN 5910-01-571-8500
NSN 5910-01-551-2090
NSN 5915-00-269-4463
NSN 2925-00-580-4931